Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1974-02-19

1976-06-29

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

178DIG29, H04N 538

Patent

active

039670562

ABSTRACT:
An automatic focusing apparatus for use in a photographic or television camera having a lens system movable in predetermined incremental displacements in relation to a subject to be photographed in search of the true focus setting. A scanner is provided for scanning the image of the subject and for generating a serial video signal indicative of the image of the subject. This serial video signal is processed by maximum and minimum value detectors which generate signals indicative of the maximum and minimum values of the serial video signal to an extreme value detector through a difference detector. Output from the extreme value detector indicates that the image of the subject is focused in the image plane.

REFERENCES:
patent: 3211831 (1965-10-01), Steiner
patent: 3356792 (1967-12-01), Peters
patent: 3555280 (1971-01-01), Richards

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